It is not a true holo, it is a reflex. I have one on a 22lr and it is a pita. There is a lot of slack in the adjustment before it engages. I ended up moving the dot to the poi rather than trying to adjust for elevation and windage.
I just noticed that you said it is hitting 15" right and you are trying to move it right. You need to move it left. The windage screw has an R and a little arrow. To move the poi left you have to turn the screw to the left or counter clockwise. Same with the Up screw. Adjustments are very coarse with not much feel.

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It is not a true holo, it is a reflex. I have one on a 22lr and it is a pita. There is a lot of slack in the adjustment before it engages. I ended up moving the dot to the poi rather than trying to adjust for elevation and windage.
I just noticed that you said it is hitting 15" right and you are trying to move it right. You need to move it left. The windage screw has an R and a little arrow. To move the poi left you have to turn the screw to the left or counter clockwise. Same with the Up screw. Adjustments are very coarse with not much feel.

PITA is correct. I will try one more time with this thing before i toss it.

Remember that if you move the dot right, the POI is moved left because you are moving the firearm barrel left to compensate for having moved the dot right.

That is probably what you are doing. I had it backwards awhile back myself when I was sighting in my new Aimpoint red-dot-sight. These sight manufacturers don't always explain this in those manuals that none of us read.